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Police officers on patrol came across the incident and detained one youths but the rest of the offenders had left the area.

PC Anne Lopez said: “This incident happened in a busy area on a Saturday night so it is likely that there were many witnesses.

“I am appealing for anyone who was in the area at the time and might have seen this incident to get in contact with me on anne.lopez@herts.pnn.police.uk or the non-emergency number 101, quoting crime reference B1/18/740.